but president obama, according to a white house official was briefed overnight. he's very much focused on what happened in boston and moving forward trying to figure out who did this and why they did this. he was briefed overnight by his homend security adviser. he's going to be briefed this morning by his homeland security adviser alissa monaco, as well as the fbi director robert mueller. and we'll be waiting to see if he says something else in addition to his comments yesterday where he said that the u.s. will respond. >> we still do not know who did this, or why. and people shouldn't jump to conclusions before we have all the facts. but, make no mistake, we will get to the bottom of this. and we will find out who did this, we'll find out why they did this. any response -- any responsible individuals, any responsible groups, will feel the full weight of justice. >> but here's what we're looking for today from the white house, john. 1:15 p.m. jay carney is on the schedule to brief. then again as i said before 3:00 p.m. eastern, president obama was supposed to be